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Shortlist for New Zealand water tunnel named

New Zealand water company Watercare has named the four contractors that have been shortlisted to tender for it NZ$1.2bn (£629M) Central Interceptor waste water tunnel scheme.

Construction on the 13km tunnel between Western Springs and Magere Wastewater Treatment Plant what has been described as New Zealand’s most ambitious tunnelling scheme and is set to start in 2019.

The contractors now bidding to win the work are CPB Contractors; Ghella-Abergeldie Harker joint venture; Pacific Networks, comprising McConnell Dowell, Fletcher Construction and Obayashi; and the Vinci joint venture formed by Vinci Grand Projets, HEB Construction and Soletanche Bachy.

According to Shayne Cunis, executive programme director for the Central Interceptor, the four strongest contractors have been chosen to move to the next stage of selection.

“All four groups have demonstrated that they have the ability and experience to deliver this project to the required standard, while adding significant value to the project,” he said.

“We are looking forward to working with them on the next stage of the process and remain committed to meeting our timeframes for delivery of the Central Interceptor for the people of Auckland.”

Design and technical documentation will be released in March and the request for proposal will be issued to the short-listed contractors in May.


The Central Interceptor challenge


The 4.5m diameter tunnel will be used to provide over 200,000m3 of stormwater and waste water storage.

The project has been described as New Zealand’s most ambitious tunnelling scheme as the drives on the 13km route will have between 22m and 110m of cover along the route and just 15m as it passes under Manukau Harbour The work also involves construction of 17 shafts.

Construction is set to start next year and be completed in 2025.

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